Means for forming paper bags.



H FREHRS MEAVNSFOR FORMING PAPER BAGS. APPLICATION mp0 A' ue.n. 1911.

Patented June 4, 1918.

2 SHEE TS-SHEET 1.

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6 Ill H. FREHRS. MEANS FOR FORMING PAPER BAGS.

APPLICATION FILED AUG.17| 1917- ,6,1@"?, Patented June 4,1918.

2 SHEETS-SHEET 2.

nnrrn Hnmvmnn Faeries, or LttBEcK, GERMANY.

MEANS FOR romaine PAPER 'B-Aes.

Specification of Letters ifatent.

"Patented Junet, 1918.

Applicatibififiled august 17, 19117. Seria'LNo. 1 86:7553.

To all whom it may "concern Be it known that I, HERMANN Fnnrms,

subject of the'German Emperor, residing at 18 Lindenstrasse, Liibeck, Gelmia ny, have invented certain new and useful Improvements in Means for Formingl faper Bags, of which the following is m-specification,

reference being had therein to the accompanying drawing. i i a This invention relates to certain new and useful improvements in apparatus for the formation 'of paper bags by folding, and. it

has for its objects among others to provide an improved apparatus whereby the bag 1s quickly and readily "formed by means of simple devices, thus permitting of the production of a bag at small cost and by unskilled labor.

Other objects and advantages of .theninvent-ion will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, "which, with the characters of reference marked thereon, form a part of this *SPGCIfiCiLtlOD, and in which Figure 1 is a front elevation of the improved apparatus withparts in section and portions broken away.

Fig. 2 is a side View with parts in section and portions broken away.

Fig. 3 is a cross section.

Fig. 4 isa detail viewof'the piston with portions broken away and parts in section.

Fig. 5 is alplan view =of tl1e paper sheet from which the bag is to be formed.

Fig. 6 is a plan view-showing the sheet after the edges thereof have been bent upward.

Fig. 7 is a wertical "section showing the position of the parts after the succeeding steps.

Fig. 8 is a vertical section of the completed bag.

Fig. 9 is a side elevation of Fig. 8.

Like characters of reference indicate like parts in the different views.

Referring to the drawings,

, a designates a frame within which the operating parts are supported, and b is the piston mounted for vertical reciprocation in any well known manner. This piston may be held in its elevated position by means of a spring, counterweight or the like, and may be forced downward in any suitable or wellknown way. The piston,

in cross section, corresponds with the bottom surface ofwthe completed bag. It may beaguided in its reciprocation in any suitable way. v

The folding mechanism whichis confined within the frame 64 comprises two :opposed downwardly curved fiat springs 0 c and the opposed fiat springs. (Z (Z..spaced apart from the springs 0 c, aslseen best in "Fig. l. e e are flat springs substantiallyvertically disposed and within "which are the surfaces f and g which are disposed opposite each other, as seenin Fig. 2. Thus by the springs 0 0 and (Z d and e e" on the one side, and the surfaces 7' and g on the other side, a channel is formed corresponding in cross section to the crosssection of the piston. It will be observed uponreference in Fig. *1 that the springs e e are'placed a little deeper than the springs (Z d and EllSOltllflt the surface :9 is somewhat deeper on the springs cc than the surface 7 on the springs (Z cl. By this arrangement, the piston b in its downward movement after passing the springs o 0 comes in contact first with the springsd d and then with the-springs-c e so that the bending around of the corner tipsis effected in pairs one after illlG other. The springs d d and c e 'are sufficiently broad to reach over the entire breadth of the bag so as to catch the folding edges of the blank in their full breadth and press them tightly'on the piston,

It has been found advantageous to bring the opposedsprings 0 undo, (Z and (Z and e and c with theirlower edges slightly closer together than the cross .section of the piston so thattheyipress tightly onthe faces of the piston. For the better accomplishmentof this end, the springs d and (Z ands "and e are somewhat sloped downwardly or converged toward their lower ends, as seen in Fig. 1.

The operation is as follows :The piston 6 being in its elevated position, as seen in Figs. 1 and 2, the blank 1 of paper or other material secured or otherwise laid off into sections, as seen in Fig. 5, is placed upon the bent plate k of the frame a and beneath the piston b. The piston is then forced downward by any suitable means and first engages on the center of the sheet 1 which corresponds to the cross sectional area of the piston and in the continued downward movement of the piston the sheet is carried along thereby so that the portion 1 of the sheet forms the bottom surface of the bag. As soon as the sheet 1 comes in contact with the springs 0 c, the opposite central portions 2 and 3 of the sheet are bent upward by said springs into the position seen in Fig. 6. The further downward movement of the piston pushes the sheet farther in through the springs (Z d, e e and the chair nel formed by the surfaces and g, so that the latter bend the sections or portions & and 5 of the sheet up on the piston. The portions 2, 3, i and 5 constitute the side walls of the completed bag. At the same time the corner tips 6 and 7 by engagement with the walls 7" f of the surface f are laid againstthe sides 2 and 3 of the sheet and are tightly pressed thereagainst by the springs d d, asillustrated in Fig. 7 Then the bent parts 9 g of the surface 9 come into action, folding and pressing the tips 8 and 9 against the sides 2 and 3, which tips are pressed tightly into place by the springs e e. The folding operation is 110w completed and the further movement of thepiston presses the bag into the channel 7.; of the frame. The folded boxes are forced into this channel with their openends upward so that each succeeding bag is forced into the next one therebeneath, The piston is again carried upward by any suitable means and the operation completed. To permit of ease of movement of the piston in its upward direction so that the completed bag will not hug tight to the piston and be sucked up thereby, the piston is formed with a longitudinal air passage 2" having an opening 2' near the upper end which extends out through the side of the piston so as to pre vent suction by accumulation of air beneath the piston.

A bag constructed as above described, especially if formed of wax paper or the like, is well adapted for containing fluid masses such as honey, molasses or the like.

After the contents of the bag have hardened, the upper overlying portions 10 of the side Walls are folded over to form a closure.

Modifications in details may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

What is claimed as new is 1. In a device for the purpose described, a reciprocatory piston, three pairs of cooperating opposed springs, channel-forming surfaces within one set of springs, the sur face of one spring being deeper than the surface of the other, said springs arranged to act in successive order.

2. In a device for the purpose described, a reciprocatory piston, three pairs of cooperating opposed springs, channel-forming surfaces within one set of springs, the surface on one spring being deeper. than the surface on the other, said springs arranged to act in successive order, the lower edges of said springs being slightly closer together than the cross section of the piston- 3. In a device for the purpose described, a reciprocatory piston, three pairs of cooperating opposed springs, channel-forming surfaces within one set of Springs, the sur' face on one spring being deeper than the surface on the other, said springs arranged to act in successive order, the one surface arranged to operate upon the material prior to the operation of the other surface.

4. In a device for the purpose described,

a reciprocatory piston, three pairs of cooperating opposed springs, channel-forming surfaces within one set of springs, the surface on one spring being deeper than the surface on the other, said springs arranged to act in successive order, the one surface arranged to operate upon the material prior to the operation of the other surface, and a frame having a channel beneath the lowermost springs into which the completedarticle is pressed by the piston after passing through said springs.

In testimony whereof I affix my signature in the presence of two witnesses.

HERMANN FREHRS.

Witnesses:

WILH. GRAEFE, FRANCISCO GoNzALBEz.

Goples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

